QuickTherm

Projects

Projects are saved in this browser. Export a .json file to back it up or move it to another device.

Project

Project titleAppears on the cover page of the exported report

Heat Loss

Steady-state envelope heat loss. Set climate and infiltration here — configure surfaces on the Surfaces tab.

Climate

CountrySets the climate, solar and compliance dataset used throughout the reportLocation

Indoor °CΔT (K)

2.0

Select city · equivalent outdoor temperature ≈ 18.0 °C (from HDD Base 18).

New Zealand · southern hemisphere (north-facing glazing is sun-facing) · compliance basis: NZBC H1 Energy Efficiency (5th edition) — H1/AS1 housing, H1/AS2 non-housing

Building use

Ground temperature (floor)

Ground °C

15.0

ΔT floor (K)

5.0

The floor loses heat to the ground, not outdoor air. Under-slab ground temperature is modelled as Select city's annual mean air temperature (13.0 °C) + 2 K of soil damping.

Thermal bridging

Fabric upliftApplied to opaque fabric conductance (framing, junctions, fixings)

Opaque UA is multiplied by 1.20. Window U-values already include frame effects, so no uplift is applied to glazing.

Infiltration

Air changes per hour (ACH)New-build ≈ 0.3, older leaky homes ≈ 1.0+

Volume (m³)

0.0

Q_inf (W)

Q_inf = 0.33 × ACH × Volume × ΔT. Volume derives from the floor and average wall height.

Running cost & carbon

Tariff ($/kWh)Heating COP

Emissions factor (kg CO₂e/kWh)New Zealand grid electricity ≈ 0.074 (Ministry for the Environment); LPG ≈ 0.21

Used for the annual cost, carbon and compliance sections of the exported PDF report.